In this book, Petroski delves deeper into the mystery of invention, to explore what everyday artifacts and sophisticated networks can reveal about the way engineers solve problems. Engineering entails more than knowing the way things work. What do economics and ecology, aesthetics and ethics, have to do with the shape of a paper clip, the tab of a beverage can, the cabin design of a turbojet, or the course of a river? How do the idiosyncrasies of individual engineers, companies and communities leave their mark on projects from Velcro to fax machines to waterworks? "Invention by Design" offers an insider's look at these political and cultural dimensions of design and development, production and construction. Henry Petroski's previous books include: "To Engineer Is Human", which was developed into a BBC television documentary; "The Pencil": "The Evolution of Useful Things"; and "Engineers of Dreams".